Odosynth’s 388911 bytes is a freeware/donationware Commodore 64 style virtual synth for Windows. 

Features:

• 1 oscillator with 4 difftent waveforms: Saw Triangle Pulse and Pitched noise
• 3 BPM sequencer with 7 rates and 2 to 8 steps .You can end a sequence or loop it.
• The first sequencer has notes from c to b and octaves from -3 to 4
• In the 2nd (waveform sequencer) you can select saw,triange,noise,ring saw,ring triangle,ring pulse.
• 3rth sequencer for octaves from -3 to 4 
• A filter with envelope from 1 to 8 stages and 13 curves you can select where you want your sustain point.
• Filter types: lowpass,hipass and bandpass.You can activate more than one filter type like on a real c64.
• Cutoff and resonance and a on/off button to save some CPU 
• A pitch envelope from 1 to 8 stages and you can select where you want your sustain point. And has a on/off button to save some cpu
• A PW envelope from 1 to 8 stages and you can select where you want your sustain point.
• A has a on/off button to save some cpu 
• Two LFOs with 19 different waveforms and free speed or 14 bpm speeds
• Ringmodulation with a bitcrucher notes from c to b and octaves from -4 to 4 
• A Bitcrusher
• Volume envelope